The OBJ file doesn't contain rigging information. You should be able to import the OBJ as a morph for V4 if you have the Morph Loader plugin (available on its own or as part of the Figure Setup Tools - and since you are trying to export as CR2 it sounds as if you already have those). Load V4, select any part, go to the Edit menu and you should have an entry for Morph Loader; choose the same preset  as you used for exporting the OBJ, Try the default Load morphs for, and if that gives an error try Primary node (using vertex list only).

Now, if you were using Morphs++ (or other morph sets) that won't get you your original settings - just a single morph snapshot which has some disadvantages: you won't be able to share the result with others, as it encapsulates data from the DAZ morph set(s); you will lose the ERC linkages to the eyes, so they won't rotate correctly if you used any morphs that shifted them from their default position. However, it will get the basic shape back 9and if you made the morph with DFormers those problems won't apply anyway).